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FMCSA - Federal Motor Carrier Safety Adminstration

CSA - Compliance, Safety, Accountability

Working Together for Safety.


SMS - Safety Measurement System SMS - Safety Measurement System

Measure vs. Percentile

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. Expand for more information.

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure only considers individual performance based on 24 months of data, with a measure of 0 indicating best performance. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. The graph below shows how the carrier’s measure correlates with its percentile rank over a selected period of time.

  • 8
  • 6
  • 4
  • 2
  • 0
  • 0
  • 10
  • 20
  • 30
  • 40
  • 50
  • 60
  • 70
  • 80
  • 90
  • 98
Measure Percentile
0 0
0.04 1
0.04 2
0.05 3
0.06 4
0.07 5
0.07 6
0.09 7
0.10 8
0.11 9
0.12 10
0.13 11
0.15 12
0.17 13
0.18 14
0.20 15
0.22 16
0.23 17
0.24 18
0.26 19
0.28 20
0.29 21
0.31 22
0.32 23
0.34 24
0.36 25
0.38 26
0.39 27
0.41 28
0.43 29
0.45 30
0.47 31
0.48 32
0.51 33
0.52 34
0.54 35
0.56 36
0.58 37
0.60 38
0.62 39
0.64 40
0.66 41
0.68 42
0.70 43
0.72 44
0.75 45
0.77 46
0.79 47
0.82 48
0.84 49
0.86 50
0.88 51
0.91 52
0.94 53
0.96 54
1.01 55
1.03 56
1.05 57
1.08 58
1.11 59
1.15 60
1.18 61
1.21 62
1.25 63
1.29 64
1.32 65
1.36 66
1.40 67
1.45 68
1.48 69
1.52 70
1.57 71
1.61 72
1.67 73
1.71 74
1.77 75
1.82 76
1.87 77
1.93 78
2.00 79
2.05 80
2.11 81
2.18 82
2.25 83
2.34 84
2.42 85
2.52 86
2.62 87
2.73 88
2.85 89
3.00 90
3.13 91
3.30 92
3.47 93
3.65 94
3.88 95
4.18 96
4.53 97
5.06 98
5.90 99
11.00 100